I'm sorry, but I am unable to physically inspect the fluorescent tube to determine if it is broken. However, if the tube is flickering, not turning on, or emitting a buzzing sound, it may be an indication that it is broken and needs to be replaced. It is important to handle broken fluorescent tubes with caution and dispose of them properly to avoid any potential hazards. **

A U-shaped dining bench typically consists of a long bench that forms a U-shape when placed against the wall or in a corner of a dining area. It often has a backrest along the wall and on the two ends, creating a cozy and enclosed seating area. The bench may be upholstered or made of wood, and it is often paired with a dining table to create a space-saving and stylish seating arrangement. **

You can buy a Spiderman costume with a U-shaped back zipper from various online retailers such as Amazon, eBay, and costume specialty stores. Make sure to check the product description and customer reviews to ensure that the costume has the specific U-shaped back zipper feature you are looking for. Additionally, you may also find such costumes at local costume shops or specialty stores that carry superhero costumes. **

Point-shaped light sources are typically used in applications where a concentrated beam of light is needed, such as flashlights, spotlights, or streetlights. On the other hand, area-shaped light sources are used in applications where a more diffused and widespread illumination is required, such as in ceiling lights, wall sconces, or ambient lighting fixtures. Each type of light source has its own unique advantages and is chosen based on the specific lighting needs of the space or application. **

Point-shaped light sources are typically used in applications where focused or directional lighting is needed, such as in flashlights, spotlights, or task lighting. Surface-shaped light sources, on the other hand, are commonly used in ambient lighting applications where a more diffused and uniform light output is desired, such as in ceiling fixtures, wall sconces, or table lamps. Each type of light source has its own unique advantages and is chosen based on the specific lighting requirements of the space. **

The Seat Ibiza 4 is a subcompact car produced by the Spanish automaker Seat. It is the fourth generation of the Ibiza model, which was first introduced in 1984. The Ibiza 4 is known for its sporty design, fuel efficiency, and practicality, making it a popular choice for urban driving and everyday use. It offers a range of engine options, modern technology features, and a comfortable interior, making it a versatile and attractive option in the subcompact car segment. **

A child seat for 4 refers to a car seat designed to safely and securely hold a child who is 4 years old. These seats are specifically designed to accommodate the size and weight of a 4-year-old child, providing the necessary support and protection while traveling in a vehicle. It is important to use a child seat that is appropriate for the child's age, weight, and height to ensure their safety in the event of a car accident. **

The maximum voltage U in volts, so that no resistance is overloaded can be found using the formula U = I * R, where U is the voltage, I is the current, and R is the resistance. To avoid overloading the resistance, the voltage should not exceed the maximum allowable voltage for the resistance. Therefore, the correct answer is 3) U = 447 V, as it is the highest voltage that does not exceed the maximum allowable voltage for the resistance. **